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Finding the Fourth Proportional to 137.99, 207.05 and 86.65

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Solution

The fourth proportional to 137.99, 207.05 and 86.65 is: 130.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.99 : 207.05 = 86.65 : x
  2. Step 2: Convert to fraction form
    137.99/207.05 = 86.65/x
  3. Step 3: Cross multiply
    137.99x = 207.05 × 86.65
  4. Step 4: Simplify right side
    137.99x = 17,940.88
  5. Step 5: Solve for x
    x = 17,940.88/137.99
  6. Step 6: Final answer
    x = 130.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.